Far-red at End of Day and Reduced Irradiance Affect Plant Height of Easter and Asiatic Hybrid Lilies

Blom, Theo J.; Tsujita, M. J.; Roberts, G. L.

doi:10.21273/hortsci.30.5.1009

Cited by 34 publications

(33 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Red/far-red ratio (R/FR ratio) is considered as one of the most important light signals that induce adaptive biochemical and morphological responses known as shade avoidance (Franklin and Whitelam 2005;Franklin 2008). It is wellknown that increasing the fraction of far-red (FR) light causes an increase in internode length and plant height of tobacco (Nicotiana tabacum Burley 21) (Kasperbauer and Peaslee 1973), hybrid lilies (Lilium longiflorum Ace and Nellie White) (Blom et al 1995) and Arabidopsis thaliana (Ruberti et al 2012), which can facilitate light penetration into the plant canopy and consequently can stimulate plant growth and yield of fruit vegetables such as greenhouse tomato. Yang et al (2012) showed increases in leaf area and light interception by supplemental FR light can improve the growth of lettuce (Cucurbita maxima×Cucurbita moschata Tetsukabuto).…”

Section: Introductionmentioning

confidence: 99%

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Zhang

Yang

et al. 2019

Journal of Integrative Agriculture

View full text Add to dashboard Cite

Far-red (FR) light regulates phytochrome-mediated morphological and physiological plant responses. This study aims to investigate how greenhouse tomato morphology and production response to different durations of FR light during daytime and at the end of day (EOD). High-wire tomato plants were grown under intra-canopy lighting consisting of red (peak wavelength at 640 nm) and blue (peak wavelength at 450 nm) light-emitting diodes (LEDs) with photosynthetic photon flux density (PPFD) of 144 μmol m-2 s-1 at 10 cm away from the lamps, and combined with overhead supplemental FR light (peak wavelength at 735 nm) with PPFD of 43 μmol m-2 s-1 at 20 cm below the lamps. Plants were exposed to three durations of FR supplemental lighting including: 06:00-18:00 (FR12), 18:00-19:30 (EOD-FR1.5), 18:00-18:30 (EOD-FR0.5), and control that without supplemental FR light. The results showed that supplemental FR light significantly stimulated stem elongation thereby resulting in longer plants compared with the control. Moreover, FR light altered leaf morphology toward higher leaf length/width ratio and larger leaf area. The altered plant architecture in FR supplemented plants led to a more homogeneous light distribution inside the canopy. Total plant biomass was increased by 9-16% under supplemental FR light in comparison with control, which led to 7-12% increase in ripe fruit yield. Soluble sugar content of the ripe tomato fruit was slightly decreased by longer exposure of the plants to FR light. Dry matter partitioning to different plant organs were not substantially affected by the FR light treatments. No significant differences were observed among the three FR light treatments in plant morphology as well as yield and biomass production. We conclude that under intra-canopy lighting, overhead supplemental FR light stimulates tomato growth and production. And supplementary of EOD-FR0.5 is more favorable, as it consumes less electricity but induces similar effects on plant morphology and yield.

show abstract

Section: Introductionmentioning

confidence: 99%

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Zhang

Yang

et al. 2019

Journal of Integrative Agriculture

View full text Add to dashboard Cite

show abstract

“…Red or FR light at the end of the day (photoperiod) is known to affect stem elongation (Blom et al, 1995;Decoteau et al, 1988;Kasperbauer and Peaslee, 1973). Tomato seedlings with end-of-day (EOD) FR light treatment had a greater height and leaf length than those with EOD-R light treatment (Decoteau and Friend, 1991).…”

mentioning

confidence: 99%

End-of-day Far-red Light Quality and Dose Requirements for Tomato Rootstock Hypocotyl Elongation

Chia¹,

Kubota

2010

horts

View full text Add to dashboard Cite

Plant morphology control is a critical technique in commercial greenhouse transplant production. Light treatment at the end of the day affects a phytochrome-regulated response affecting plant height among other characteristics and has been studied by biologists for many years. Recognizing the need to produce long hypocotyls in vegetable grafting, effects of end-of-day far-red (EOD-FR) light on tomato rootstock hypocotyl elongation were investigated. Two commercial rootstock cultivars, Aloha (Solanum lycopersicum) and Maxifort (S. lycopersicum × S. habrochaites), were used for the experiments examining responses to EOD-FR light quality [red to far-red ratio (R/FR)] and EOD-FR light dose in a greenhouse environment. In the EOD-FR light quality experiment using ‘Aloha’ seedlings, incandescent light (R/FR = 0.47) induced significant hypocotyl elongation (20%) compared with the untreated control. Incandescent light with a spectral cut filter (reducing R/FR to 0.05) induced a greater hypocotyl elongation (44%) than unfiltered light, confirming the importance of use of light with a lower R/FR (or purer FR) light source in EOD-FR treatments. In the experiment on EOD-FR light dose–response, hypocotyl elongation of both ‘Aloha’ and ‘Maxifort’ was increased by increasing FR intensity as well as FR treatment duration at a lower dose range. The dose saturation curve of hypocotyl length was well described using a Michaelis-Menten-type model with FR dose (in mmol·m−2·d−1) as an independent variable. The model-based estimation of 90% saturating FR light dose for ‘Aloha’ and ‘Maxifort’ was 5 to 14 mmol·m−2·d−1 and 8 to 15 mmol·m−2·d−1, respectively, although practical near saturation dose seems to be 2 to 4 mmol·m−2·d−1 for both cultivars. None of the EOD-FR treatments affected plant dry weight, stem diameter, or plastochron index. Hence, elongation was achieved without compromising growth and development. EOD-FR was shown to be an effective non-chemical means allowing transplant propagation industry to produce long hypocotyls for grafting use.

show abstract

“…Height control in lilies can be achieved with several techniques including negative DIF (night temperature greater than day temperature) (Erwin and Heins, 1990), photoperiod control, reduction of far red light (Blom et al, 1995), and chemical plant growth retardants (PGRs) (Lewis and Gilbertz, 1987;Bailey and Miller 1989;Holcomb et al, 1991). The relative ease and flexibility of application make PGRs a popular choice for height control in lilies.…”

mentioning

confidence: 99%

Efficacy of Plant Growth Retardants as Preplant Bulb Dips for Height Control in LA and Oriental Hybrid Lilies

Ranwala¹,

Legnani²,

Reitmeier³

et al. 2002

horttech

View full text Add to dashboard Cite

We evaluated preplant bulb dips in three commercial plant growth retardants [ancymidol (A-Rest), paclobutrazol (Bonzi), and uniconazole (Sumagic)] for height control in seven oriental hybrid lily (Lilium) cultivars (Aubade, Berlin, Casa Blanca, Muscadet, Sissi, Star Gazer, and Tom Pouce), and seven LA-hybrid lily [hybrids resulting from crosses between easter lily (Lilium longiflorum) and Asiatic hybrids] cultivars (Aladdin's Dazzle, Best Seller, Cebeco Dazzle, Royal Dream, Royal Parade, Royal Perfume, and Salmon Classic) grown in containers. A 1-min dip into a range of concentrations of each product was used to determine the optimum concentrations for height control. The results indicate that bulb dips, especially with uniconazole and paclobutrazol, can be a highly effective means of height control in hybrid lilies. Cultivars varied in their response to growth retardant treatments. In general, LA-hybrid lilies were much more responsive to the growth retardant treatments than oriental hybrids and required lower rates for comparable height control. Delays in flowering, increased bud abortion and leaf yellowing were observed only with high concentrations of uniconazole or paclobutrazol where the height reduction was also too excessive for a commercially acceptable crop.

show abstract

Far-red at End of Day and Reduced Irradiance Affect Plant Height of Easter and Asiatic Hybrid Lilies

Cited by 34 publications

References 13 publications

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

End-of-day Far-red Light Quality and Dose Requirements for Tomato Rootstock Hypocotyl Elongation

Efficacy of Plant Growth Retardants as Preplant Bulb Dips for Height Control in LA and Oriental Hybrid Lilies

Contact Info

Product

Resources

About